dygraphs

<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"> <style> .KEYW {color: #933;} .COMM {color: #bbb; font-style: italic;} .NUMB {color: #393;} .STRN {color: #393;} .REGX {color: #339;} .line {border-right: 1px dotted #666; color: #666; font-style: normal;} </style></head><body><pre> 1 /** 2 * @license 3 * Copyright 2011 Dan Vanderkam (danvdk@gmail.com) 4 * MIT-licenced: https://opensource.org/licenses/MIT 5 */ 6 7 /** 8 * @fileoverview Based on PlotKitLayout, but modified to meet the needs of 9 * dygraphs. 10 */ 11 12 /*global Dygraph:false */ 13 "use strict"; 14 15 import * as utils from './dygraph-utils'; 16 17 /** 18 * Creates a new DygraphLayout object. 19 * 20 * This class contains all the data to be charted. 21 * It uses data coordinates, but also records the chart range (in data 22 * coordinates) and hence is able to calculate percentage positions ('In this 23 * view, Point A lies 25% down the x-axis.') 24 * 25 * Two things that it does not do are: 26 * 1. Record pixel coordinates for anything. 27 * 2. (oddly) determine anything about the layout of chart elements. 28 * 29 * The naming is a vestige of Dygraph's original PlotKit roots. 30 * 31 * @constructor 32 */ 33 var DygraphLayout = function(dygraph) { 34 this.dygraph_ = dygraph; 35 /** 36 * Array of points for each series. 37 * 38 * [series index][row index in series] = |Point| structure, 39 * where series index refers to visible series only, and the 40 * point index is for the reduced set of points for the current 41 * zoom region (including one point just outside the window). 42 * All points in the same row index share the same X value. 43 * 44 * @type {Array.<Array.<Dygraph.PointType>>} 45 */ 46 this.points = []; 47 this.setNames = []; 48 this.annotations = []; 49 this.yAxes_ = null; 50 51 // TODO(danvk): it's odd that xTicks_ and yTicks_ are inputs, 52 // but xticks and yticks are outputs. Clean this up. 53 this.xTicks_ = null; 54 this.yTicks_ = null; 55 }; 56 57 /** 58 * Add points for a single series. 59 * 60 * @param {string} setname Name of the series. 61 * @param {Array.<Dygraph.PointType>} set_xy Points for the series. 62 */ 63 DygraphLayout.prototype.addDataset = function(setname, set_xy) { 64 this.points.push(set_xy); 65 this.setNames.push(setname); 66 }; 67 68 /** 69 * Returns the box which the chart should be drawn in. This is the canvas's 70 * box, less space needed for the axis and chart labels. 71 * 72 * @return {{x: number, y: number, w: number, h: number}} 73 */ 74 DygraphLayout.prototype.getPlotArea = function() { 75 return this.area_; 76 }; 77 78 // Compute the box which the chart should be drawn in. This is the canvas's 79 // box, less space needed for axis, chart labels, and other plug-ins. 80 // NOTE: This should only be called by Dygraph.predraw_(). 81 DygraphLayout.prototype.computePlotArea = function() { 82 var area = { 83 // TODO(danvk): per-axis setting. 84 x: 0, 85 y: 0 86 }; 87 88 area.w = this.dygraph_.width_ - area.x - this.dygraph_.getOption('rightGap'); 89 area.h = this.dygraph_.height_; 90 91 // Let plugins reserve space. 92 var e = { 93 chart_div: this.dygraph_.graphDiv, 94 reserveSpaceLeft: function(px) { 95 var r = { 96 x: area.x, 97 y: area.y, 98 w: px, 99 h: area.h 100 }; 101 area.x += px; 102 area.w -= px; 103 return r; 104 }, 105 reserveSpaceRight: function(px) { 106 var r = { 107 x: area.x + area.w - px, 108 y: area.y, 109 w: px, 110 h: area.h 111 }; 112 area.w -= px; 113 return r; 114 }, 115 reserveSpaceTop: function(px) { 116 var r = { 117 x: area.x, 118 y: area.y, 119 w: area.w, 120 h: px 121 }; 122 area.y += px; 123 area.h -= px; 124 return r; 125 }, 126 reserveSpaceBottom: function(px) { 127 var r = { 128 x: area.x, 129 y: area.y + area.h - px, 130 w: area.w, 131 h: px 132 }; 133 area.h -= px; 134 return r; 135 }, 136 chartRect: function() { 137 return {x:area.x, y:area.y, w:area.w, h:area.h}; 138 } 139 }; 140 this.dygraph_.cascadeEvents_('layout', e); 141 142 this.area_ = area; 143 }; 144 145 DygraphLayout.prototype.setAnnotations = function(ann) { 146 // The Dygraph object's annotations aren't parsed. We parse them here and 147 // save a copy. If there is no parser, then the user must be using raw format. 148 this.annotations = []; 149 var parse = this.dygraph_.getOption('xValueParser') || function(x) { return x; }; 150 for (var i = 0; i < ann.length; i++) { 151 var a = {}; 152 if (!ann[i].xval && ann[i].x === undefined) { 153 console.error("Annotations must have an 'x' property"); 154 return; 155 } 156 if (ann[i].icon && 157 !(ann[i].hasOwnProperty('width') && 158 ann[i].hasOwnProperty('height'))) { 159 console.error("Must set width and height when setting " + 160 "annotation.icon property"); 161 return; 162 } 163 utils.update(a, ann[i]); 164 if (!a.xval) a.xval = parse(a.x); 165 this.annotations.push(a); 166 } 167 }; 168 169 DygraphLayout.prototype.setXTicks = function(xTicks) { 170 this.xTicks_ = xTicks; 171 }; 172 173 // TODO(danvk): add this to the Dygraph object's API or move it into Layout. 174 DygraphLayout.prototype.setYAxes = function (yAxes) { 175 this.yAxes_ = yAxes; 176 }; 177 178 DygraphLayout.prototype.evaluate = function() { 179 this._xAxis = {}; 180 this._evaluateLimits(); 181 this._evaluateLineCharts(); 182 this._evaluateLineTicks(); 183 this._evaluateAnnotations(); 184 }; 185 186 DygraphLayout.prototype._evaluateLimits = function() { 187 var xlimits = this.dygraph_.xAxisRange(); 188 this._xAxis.minval = xlimits[0]; 189 this._xAxis.maxval = xlimits[1]; 190 var xrange = xlimits[1] - xlimits[0]; 191 this._xAxis.scale = (xrange !== 0 ? 1 / xrange : 1.0); 192 193 if (this.dygraph_.getOptionForAxis("logscale", 'x')) { 194 this._xAxis.xlogrange = utils.log10(this._xAxis.maxval) - utils.log10(this._xAxis.minval); 195 this._xAxis.xlogscale = (this._xAxis.xlogrange !== 0 ? 1.0 / this._xAxis.xlogrange : 1.0); 196 } 197 for (var i = 0; i < this.yAxes_.length; i++) { 198 var axis = this.yAxes_[i]; 199 axis.minyval = axis.computedValueRange[0]; 200 axis.maxyval = axis.computedValueRange[1]; 201 axis.yrange = axis.maxyval - axis.minyval; 202 axis.yscale = (axis.yrange !== 0 ? 1.0 / axis.yrange : 1.0); 203 204 if (this.dygraph_.getOption("logscale") || axis.logscale) { 205 axis.ylogrange = utils.log10(axis.maxyval) - utils.log10(axis.minyval); 206 axis.ylogscale = (axis.ylogrange !== 0 ? 1.0 / axis.ylogrange : 1.0); 207 if (!isFinite(axis.ylogrange) || isNaN(axis.ylogrange)) { 208 console.error('axis ' + i + ' of graph at ' + axis.g + 209 ' can\'t be displayed in log scale for range [' + 210 axis.minyval + ' - ' + axis.maxyval + ']'); 211 } 212 } 213 } 214 }; 215 216 DygraphLayout.calcXNormal_ = function(value, xAxis, logscale) { 217 if (logscale) { 218 return ((utils.log10(value) - utils.log10(xAxis.minval)) * xAxis.xlogscale); 219 } else { 220 return (value<spa